I never associated an abattoir to air pollution (the more you know) but just doing some quick googling, it looks like this sensor would help exactly in measuring pollution from an abattoir!
> All the HQ values exceeded the threshold value, set at the unity, implying that H2S, SO2 and NH3 are likely to cause adverse health effects in the area. Conclusively, continuous operation of this abattoir within the residential area can constitute a great environmental menace to the residents of the area and can result in complication to those with existing health challenge.
RE cost: I'm currently on a 3 month rental through https://ambilabs.com, but plan on renting longer, and possibly purchase down the line. I think purchase price is somewhere around $10,000+ with a $1000/yr fee. I got a special deal, but it's a few thousand dollars for a few months, definitely not cheap, but grade A service so far!
Edit: Also, how much does the AQMesh sensor cost?